tree b6639a84e455f032433bfb1fcebc27111e071713
parent 0da8ce1e96bedff697f7133c8cfb328390b6d11d
author Dave Watson <davejwatson@fb.com> 1455720974 -0800
committer Jason Evans <je@fb.com> 1456279765 -0800

Remove rbt_nil

Since this is an intrusive tree, rbt_nil is the whole size of the node
and can be quite large.  For example, miscelm is ~100 bytes.